Resin composition for cationic electrodeposition coating
CA 2205695 C · Owner: Nakashio, Masaaki · Inventors: Kawashima, Junko; Nakashio, Masaaki; Arakura, Shoichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a resin composition for cationic electrodeposition coating containing (A) an epoxy resin (a base resin) having cationic groups and (B) a blocked polyisocyanate (a curing agent), characterized in that a blocked polyisocyanate, (B) in which a part of the isocyanate groups is polymerized with a polyol and which is blocked by (1) a blocking agent represented by a formula R-(OC2H3X)n-OH (wherein R is an alkyl having 1-6 carbon atom(s); X is H or methyl; and n is 1-6) and having a molecular weight of not less than 150 and also by (2) another blocking agent having a deblocking temperature of not higher than about 150°C is used.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 20, 1997 and granted October 10, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.